M2 Exam- Requires Respondus LockDown Browser

Question 1 Not yet graded / 10 pts Click this link to access the Periodic Table. This may be helpful throughout the exam. Show the calculation of the molecular weight for the following compounds, reporting your answer to 2 places after the decimal. 1. (NH4)2CO3 2. C8H6NO 4Br Your Answer: 1. N=28.02 H=8.064 C=12.01 O=48 add =96.09 MW 2. C= 96.08 H=6.048 N=14.01 O=64 Br=79.90 add =260.04 MW 1. 2N + 8H + C + 3O = 96.09 2. 8C + 6H + N + 4O + Br = 260.04 Question 2 Not yet graded / 10 pts Click this link to access the Periodic Table. This may be helpful throughout the exam. Show the calculation of the number of moles in the given amount of the following substances. Report your answerto 3 significant figures. 1. 13.0 grams of Al2(SO4)3 2. 16.0 grams of C7H5NOBr Your Answer: 1. Al2(SO4)3 Al =53.96 S= 96.21 O=192 =342.17MW moles = 13.0g/342.17 =.0380 moles 2. C7H 5NOBr C=84.07 H=5.04 N=14.01 O=16 Br=79.90 =199.02 MW moles = 16g/199.02 MW =.0804 moles 1. Moles = grams / molecular weight = 13.0 / 342.17 = 0.0380 mole 2. Moles = grams / molecular weight = 16.0 / 199.02 = 0.0804 mole Question 3